Selecting array values from specific indexes order by index array

Question

I want to select array values from specific indexes Now I have this.

var xs = new[] { 11,12,13,14,15 };
var ind = new[] { 3,2,1,0 };
var results = xs.Where((x, idx) => ind.Contains(idx)).ToArray();

The result is {11,12,13,14} However, I want my result to be ordered by index array which should be {14,13,12,11}

Thank you very much

Rob Lyndon · Accepted Answer · 2014-02-20 21:50:00Z

3

var results = ind.Select(i => xs[i]).ToArray();

answered Feb 20, 2014 at 21:50

Rob Lyndon

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3 Comments

user3334725 Over a year ago

Sorry. I accidentally hit the wrong vote. Why couldn't I figure this out. Thanks a lot man

Rob Lyndon Over a year ago

No worries dude. Linq is a joy when you start to get a feel for it.

user3334725 Over a year ago

Thanks. I wish I could enjoy it. It's a pain in the ass for me now

w.b · Accepted Answer · 2014-02-20 22:05:06Z

0

var array = xs.Zip(ind, (x, i) => new Tuple<int, int>(x, i))
           .OrderBy(t => t.Item2)
           .Select(t => t.Item1)
           .ToArray();

answered Feb 20, 2014 at 22:05

w.b

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